Pregnancy ComplicationsPregnancyPregnancy OutcomePre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsPregnancy Trimester, FirstPregnancy, EctopicAbortion, SpontaneousPregnancy Complications, NeoplasticFetal Growth RetardationAbruptio PlacentaePremature BirthPregnancy, AnimalPlacentaPregnancy Trimester, SecondUterine ArteryPregnancy Trimester, ThirdPostoperative ComplicationsCivil DisordersPlacenta DiseasesPregnancy Complications, InfectiousEclampsiaPregnancy, TwinObstetric Labor, PrematureInfant, NewbornGestational AgePlacental CirculationTrophoblastsCongenital AbnormalitiesDiabetes, GestationalFetal DeathPreconception CarePregnancy, High-RiskCesarean SectionPregnancy, MultipleObstetric Labor ComplicationsStillbirthPrenatal CareUterusInfant, Small for Gestational AgeAbortion, HabitualUltrasonography, PrenatalRisk FactorsRetrospective StudiesPregnancy ProteinsBirth WeightPregnancy RateMaternal AgeParityAntibodies, AntiphospholipidAntigen PresentationPlacental InsufficiencyPregnancy TrimestersPlacentationMultiple Birth OffspringPregnancy TestsDelivery, ObstetricMaternal-Fetal ExchangeProspective StudiesPregnancy in DiabeticsPregnancy, TubalAntiphospholipid SyndromeReproductive Techniques, AssistedMaternal WelfareFetal DevelopmentInfant, Low Birth WeightFetal Membranes, Premature RuptureFertilization in VitroCohort StudiesTreatment OutcomePregnancy in AdolescenceDeciduaOdds RatioThrombophiliaLogistic ModelsRisk AssessmentPregnancy, UnplannedPregnancy, UnwantedIntraoperative ComplicationsTime FactorsIncidenceHomocysteineNorwayInfant, PrematurePregnancy Complications, ParasiticFollow-Up StudiesUnited StatesPregnancy, ProlongedCase-Control StudiesQuestionnairesAbortion, InducedPrevalenceConfidence IntervalsPregnancy, AbdominalBiological MarkersPregnancy MaintenanceEmbryo Implantation